When her power is being activated, it allows her to shoot flash bullets from her fingers.

Eruna is a high-tension, overreaction-prone, and overly fantasizing girl who really likes cute girls. Before entering high school, she used to play a lot of galges and in fact the main reason why she even attended Mikagura Academy in the first place was to meet the model of the school pamphlet. She is prone to glomping girls such as Himi and also fantasizing about relationships with Seisa or Otone. Apart from being interested in girls, she also has fujoshi tendencies, occasionally reacting to moments between Yuto and Asuhi or Usamaru and Tonkyun. She is also quite a big eater, stating once that no matter how much she eats she won't easily get fat, and really likes to be spoiled by others, particularly cute girls. However, when someone needs help, she doesn't hesitate to lend a hand to them.

Optimistic and positive, the word "lose" doesn't exist in her dictionary and she always tries her best. She is very cheerful and can easily get along with anyone, even with hard-to-approach people like Seisa or Kyoma. Although she seems like an airhead, she can be pretty serious and keen regarding other people's feelings. She has a magnetic personality and tends to attract people, as noted by both Asuhi and Seisa.

When in battle, she's not good at making complex battle strategies, so she tends to rely more on her physical ability and only uses her power when she's at a dead end. She holds fourth place in the top 10 of the Rookie Battle Tournament.